void main() {
  // 1.
  var person = {
    "name": "张三",
    "age": 20,
    "work": ["程序员", "送外卖"]
  };
  print(person);
  print(person['name']);
  print(person['age']);
  print(person['work']);

  // 2.
  var p = new Map();
  p["name"] = "李四";
  p["age"] = 22;
  p["work"] = ["程序员", "送外卖"];
  print(p);
}
